JPS5930915Y2 - Charging device of electronic copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charging device for an electronic copying machine that is installed near a conveyance path for copy paper such as photosensitive paper or transfer paper.

This type of charging device is functionally required to transport copy paper such as photosensitive paper or transfer paper smoothly and reliably, to produce stable corona discharge, and to have a long lifespan for the charging wire.

However, if the copy paper contains moisture, the leading edge of the paper may fall into the conductive shield, causing a paper jam, or the charged wire may vibrate and break due to high voltage being applied. It is well known that

Therefore, in the past, as shown in Fig. 1, the opening of the shield case a was covered with nylon sb, or as shown in Fig. 2, an insulating bridge C9C was provided to protect the copy paper from the shield case. We are trying to prevent this from falling.

Further, as shown in FIG. 1, the charging wire e is held down by the upper end surface of a vibration prevention plate d protruding from the inner bottom of the shield case a to prevent vibration of the charging wire e.

However, with these conventional methods (the charged wire cannot be replaced without removing the nylon wire or bridge, which is extremely troublesome, and the nylon wire or wide bridge that crosses over the charged wire many times), the charged wire cannot be replaced. It becomes uneven and tingly.

Furthermore, the paper guide and the anti-vibration plate for the charged wire are separate parts for each function, resulting in an inconvenience of increased costs.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to have a simple structure while ensuring that the charged wire is prevented from falling into the shield case and early breaking of the charged wire due to vibration. Therefore, it is an object of the present invention to provide a charging device for an electronic copying machine that can prevent the above problems, easily rewire the charging wire, and reduce costs without impairing the charging performance.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

1 in the figure is a photosensitive drum of a transfer type electronic copying machine, and below this photosensitive drum 10 is a charging device 2 for transfer and a charging device 3 for peeling.
are arranged parallel to the axis of the photosensitive drum 1.

Further, a copy paper conveyance path 4 is formed between these charging devices 2 and 3 and the photosensitive drum 1, and a transfer paper A as a copy paper is formed.
It is designed so that it can be conveyed almost horizontally and in the side direction.

On the other hand, an inverted visible image B is formed on the photosensitive surface 1a of the photosensitive drum 1 through a charging device, an exposure device, a developing device, etc. (not shown), and the transfer image B is transferred through the transfer path 4. This image B is superimposed on paper A.

1 Then, the image B is electrostatically attracted to the transfer paper A by the action of the transfer charging device 2, and is transferred to the transfer paper A as a normal visible image, and the image B is transferred to the photosensitive drum 1 side by the action of the peeling charging device 3. The transfer paper A that is electrostatically attracted to the transfer paper A is peeled off toward the conveyance path 4 side.

Further, the charging device 3 for peeling is provided with a charging wire vibration prevention device 5 which also serves as a paper guide.
This is to prevent the charging wire 7 from falling into the shield case 6 and from vibrating the charged wire 7.

The charged wire vibration prevention device 5 is composed of three insulating support plates 8 arranged as described later.

These insulating support plates 8 are thin plates, for example, punched and formed from a vinyl chloride plate in a substantially inverted shape, and are located on the side of the conductive shield case 6 in the conveyance direction of the transfer paper A. The transfer paper A is adhered to one channel wall 6a in a state corresponding to each size.

Further, these insulating support plates 8... are horizontal support parts 8a...
- extends in a direction above and perpendicular to the charged wire 7 which is stretched under tension within the shield case 6.

The lower end surfaces of these horizontal support parts 8a... serve as charged wire support surfaces 9 that are in contact with the charged wire I, and the charged wires are provided between these end surfaces and the other channel wall 6b of the shield case 6. A gap t for insertion and removal of the charged wire is formed so that the charged wire 7 can be easily replaced without removing the insulating support plate 8 when the T is re-strung.

Further, the upper end surface of the horizontal support portion 8a is an inclined surface with a slightly inclined lower end on the leading end surface side, so that the leading end of the transfer paper A, which is oriented in the direction of falling into the shield case 6, is guided along the transport path. It serves as a paper guide surface 10 that guides the paper to the 4th side.

The midway portion of the charged wire 7 is supported by the charged wire support surface 9 of the insulating support plate 8 to prevent vibration when high voltage is applied, and the charged wire 7 is damped due to moisture. The leading edge of the transfer paper A, which is oriented in the falling direction, is guided in the normal direction by the paper guide surface 10 .

Furthermore, since the insulating support plates 8 are thin, charging can be performed reliably without causing uneven charging.

In the above-mentioned embodiment, the charging device of the present invention was used as a peeling charging device of a transfer type electronic copying machine, but the present invention is not limited to this, and can be used for copying photosensitive paper, transfer paper, etc. As long as it is provided near the paper conveyance path, it may be used as a charging device that requires other functions.

In addition, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

As explained above, in the charging device of an electronic copying machine that is installed near the conveyance path for conveying copy paper, the present invention provides a charging wire that prevents vibration of the charged wire by coming into contact with the charged wire stretched inside the shield case. It has a support surface and a paper guide for guiding and correcting copy paper that is oriented toward the inside of the shield case and deviates from the transport path, and has a tip end facing the inner wall surface of the shield case with a gap therebetween. This device is equipped with a charged wire vibration prevention device that also serves as a paper guide and is made of a thin insulating support plate.

Therefore, it is possible to prevent early breakage due to vibration of the charged wire, and it is also possible to reliably prevent damp copy paper such as photosensitive paper or transfer paper from falling into the shield case.

Furthermore, compared to the conventional structure in which the paper guide and the anti-vibration plate for the charged wire are separate parts for each function, the structure can be simplified and costs can be reduced.

In addition, since the tip of the insulating support plate faces the inner wall of the shield case with a gap for insertion and removal of the charged wire, it is easy and efficient to replace the charged wire without removing the insulating support plate. I can do it.

Further, since the insulating support plate is thin, it has various practical effects such as not causing any problems in charging performance.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing different conventional examples, Figure 3 is a longitudinal cross-sectional side view schematically showing an embodiment of the present invention adopted as a charging device for stripping, and Figure 4 is the same. FIG. 2... Charging device, 4... Conveyance path, 5...
...Charged wire vibration prevention device that also serves as a paper guide, 6.. Shield case, 7.. Charged wire, 8.. Insulating support plate, 9.. Charged wire support surface, 10.. ...Paper guide surface, A...Copy paper, l...Gap.

Claims (1)

[Scope of utility model registration request] A shield case provided opposite to a conveyance path for conveying copy paper, a charged wire stretched inside the shield case, a charged wire support surface that comes into contact with the charged wire to prevent vibration of the charged wire, and the above-mentioned. It has a paper guide surface that guides and corrects copy paper that has deviated from the conveyance path and is oriented toward the inside of the shield case toward the conveyance path, and has a leading end facing the inner wall surface of the shield case with a gap for insertion and removal of the charged wire. 1. A charging device for an electronic copying machine, comprising: a charging wire vibration prevention device which also serves as a paper guide and is made of a thin insulating support plate.